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University of Oxford professor Margaret Olwen MacMillan addresses senior military leadership during the 18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey-hosted Strategic Studies Seminar at the Eisenhower Executive Office Building in Washington D.C., Dec. 2, 2014. The Chairman invited Deputy Secretary of Defense Robert O. Work, Combatant Commanders, and directors from the Joint Staff to attend the seminar to engage in strategic thinking; analyzing past, present, and future global political-military issues facing the United States military. DoD photo by Army Staff Sgt. Sean K. Harp/Released